// 购物车数据相关

import { defineStore } from 'pinia'
import { ref,computed } from 'vue'
import { useUserStore } from './user'
import { insertCartAPI, findNewCartListAPI, delCartAPI } from '@/apis/cart'
export const useCartStore = defineStore('cart', () => {
    const userStore = useUserStore()
    const isLogin = computed(() => userStore.userInfo.token)
    // 1.定义state - cartList
    const cartList = ref([])
    // 2.定义action -addCart
    const addCart = async (goods) => {
        const { skuId, count } = goods
        if (isLogin.value) {
            await insertCartAPI( {skuId, count })
            updateNewList()
        } else {
        // 添加购物车操作
        // 已添加过 - count + 1
        // 没有添加过 - 直接push
        // 思路：通过匹配传递过来的商品对象中的skuId能不能在cartList中找到，找到了就是添加过
        const item = cartList.value.find((item) =>goods.skuId === item.skuId)
        if (item) {
            // 找到了 直接count+1
            item.count++
        } else {
            cartList.value.push(goods)
        }
            // 执行本地逻辑     
        }
    }

    // 获取最新购物车列表action
    const updateNewList = async () => {
        const res = await findNewCartListAPI()
        cartList.value = res.result
    }

    // 删除购物车
    const deleteCart = async (skuId) => {
        if (isLogin.value) {
            // 调用接口实现接口购物车的删除功能
        await delCartAPI([skuId])
        updateNewList()
        } else {
        const idx = cartList.value.findIndex((item) => skuId === item.skuId)
        cartList.value.splice(idx, 1)
        }
    }

    // 清除购物车
    const clearCart = () => {
        cartList.value = []
    }

    // 单选功能
    const singCheck = (skuId, selected) => {
        // 通过skuId找到要修改的那一项，然后把他的selected字段修改成最新传入的字段
           const item = cartList.value.find((item) => item.skuId === skuId)
           item.selected = selected
    }

    // 全选功能
    const allCheck = (selected) => {
        // 把cartList中的每一项的selected都设置为当前的状态
        cartList.value.forEach(item => item.selected = selected)
    }

    // 计算属性
    // 1.总的数量,所有项的count之和
   const allCount = computed(() => cartList.value.reduce((a, c)=> a + c.count, 0))
    // 2.总价 所有项的count*price之和
   const allPrice = computed(() => cartList.value.reduce((a, c)=> a + c.count * c.price, 0)) 
 
   // 是否全选
   const isAll = computed(()=> cartList.value.every((item) => item.selected))

   // 已选择数量
   const selectedCount = computed(() => cartList.value.filter(item => item.selected).reduce((a, c) => a + c.count, 0))
   
   // 已选择商品价格合计
   const selectTotal = computed(() => cartList.value.filter(item => item.selected).reduce((a, c) => a + c.count * c.price, 0))
    return {
        cartList,
        addCart,
        deleteCart,
        allCount,
        allPrice,
        singCheck,
        isAll,
        allCheck,
        selectedCount,
        selectTotal,
        clearCart,
        updateNewList
    }
}, {
    persist:true,
})